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地质学报  2010 

晓天-磨子潭剪切带的早白垩世活动及其对北大别穹隆演化的制约

, PP. 618-630

Keywords: 晓天-磨子潭剪切带,未变形岩体,U-Pb锆石定年,后造山伸展断层

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Abstract:

晓天-磨子潭剪切带是大别造山带内北大别杂岩带与北淮阳浅变质岩带的地表分界线,其构造演化特征可以为北大别穹隆的形成演化提供重要制约。本次工作通过对晓天-磨子潭韧性剪切带内4个未变形岩体的LA-ICPMS锆石U-Pb年龄测定,晓天-磨子潭剪切带目前出露地表的韧性剪切带形成于早白垩世130-120Ma期间,表现为后造山伸展断层。构造分析指示,晓天-磨子潭剪切带为形成于北大别穹隆深处的同一条平缓韧性拆离剪切带。该平缓剪切带的形成指示北大别单元在早白垩世初的造山带重力垮塌中发生了深部地壳物质的韧性侧向流动,而该剪切带则是地壳物质韧性侧向流动的上部运动边界。在随后的大规模岩浆上升与浮力增加中,该剪切带与北大别穹隆一起发生隆升而使其变陡,并由于不均匀的隆升幅度而使剪切带表现出现今的几何学特征。晓天-磨子潭剪切带的演化指示北大别穹隆是大别造山带晚造山伸展过程中形成的变质核杂岩。

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